At the end of the third chapter, the young scientists figure out that the institute director Janos Nevstruev, specifically his U-Janus version, is a "contramote", i.e. lives backwards in time. It turns out that A-Janus is the original, who, at some point in his future, will have subjected himself to an experiment that made him jump 48 hours back into the past every midnight. This created the U-Janus, who remembers the future, having lived through it already, but not the past, which is his subjective future.--------------------